This is a note to let you know that I've just added the patch titled staging: comedi: avoid memleak for subdevice private to my staging git tree which can be found at git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging.git in the staging-next branch. The patch will show up in the next release of the linux-next tree (usually sometime within the next 24 hours during the week.) The patch will also be merged in the next major kernel release during the merge window. If you have any questions about this process, please let me know. >From 67aa4acbc97f6a55b328e4e2305ef19cbe949d85 Mon Sep 17 00:00:00 2001 From: Ian Abbott <abbotti@xxxxxxxxx> Date: Mon, 7 Oct 2013 15:51:58 +0100 Subject: staging: comedi: avoid memleak for subdevice private `comedi_alloc_spriv()` allocates private storage for a comedi subdevice and sets the `SRF_FREE_SPRIV` flag in the `runflags` member of the subdevice to allow the private storage to be automatically freed when the comedi device is being cleaned up. Unfortunately, the flag gets clobbered by `do_cmd_ioctl()` which calls `comedi_set_subdevice_runflags()` with a mask value `~0` and only the `SRF_USER` and `SRF_RUNNING` flags set, all the other SRF flags being cleared. Change the calls to `comedi_set_subdevice_runflags()` that currently use a mask value of `~0` to use a more relevant mask value. For `do_cmd_ioctl()`, the relevant SRF flags are `SRF_USER`, `SRF_ERROR` and `SRF_RUNNING`. (At one time, `SRF_RT` would be included in that set of flags, but it is no longer used.) For `comedi_alloc_spriv()` replace the call to `comedi_set_subdevice_runflags()` with a simple OR-assignment to avoid unnecessary use of a spin-lock. Signed-off-by: Ian Abbott <abbotti@xxxxxxxxx> Cc: <stable@xxxxxxxxxxxxxxx> # 3.11.y Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- drivers/staging/comedi/comedi_fops.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git a/drivers/staging/comedi/comedi_fops.c b/drivers/staging/comedi/comedi_fops.c index 3594bd4..721df31 100644 --- a/drivers/staging/comedi/comedi_fops.c +++ b/drivers/staging/comedi/comedi_fops.c @@ -543,7 +543,7 @@ void *comedi_alloc_spriv(struct comedi_subdevice *s, size_t size) { s->private = kzalloc(size, GFP_KERNEL); if (s->private) - comedi_set_subdevice_runflags(s, ~0, SRF_FREE_SPRIV); + s->runflags |= SRF_FREE_SPRIV; return s->private; } EXPORT_SYMBOL_GPL(comedi_alloc_spriv); @@ -1475,7 +1475,8 @@ static int do_cmd_ioctl(struct comedi_device *dev, if (async->cmd.flags & TRIG_WAKE_EOS) async->cb_mask |= COMEDI_CB_EOS; - comedi_set_subdevice_runflags(s, ~0, SRF_USER | SRF_RUNNING); + comedi_set_subdevice_runflags(s, SRF_USER | SRF_ERROR | SRF_RUNNING, + SRF_USER | SRF_RUNNING); /* set s->busy _after_ setting SRF_RUNNING flag to avoid race with * comedi_read() or comedi_write() */ -- 1.8.4.6.g82e253f.dirty -- To unsubscribe from this list: send the line "unsubscribe stable" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html